Abstract
A series of calix[4]arene-bis-crown ethers were synthesized in a fixed 1,3-alternate conformation with good yields by the reaction of a monocyclic calixcrown ether with multiethyleneglycol di-p-toluenesulfonate in the presence of cesium carbonate. In the preparation of the monocyclic calixcrown ethers (1 and 2), the use of potassium carbonate as a base provided the best yield regardless of the template concept. In two phase extraction and competitive transport experiments for ligand-metal complexation, calix[4]arene biscrown (5) provided the best selectivity for potassium ion. When a calixbiscrown ether (4) bearing different sized crown ether loops coordinates to K+ and Cs+, respectively, the changes of peak splitting patterns and chemical shift on 1H NMR spectra are dependent on the complexed metal ion species.
Original language | English |
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Pages (from-to) | 359-370 |
Number of pages | 12 |
Journal | Journal of Inclusion Phenomena |
Volume | 37 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - 2000 |
Externally published | Yes |
Keywords
- Alkali cation
- Calixarene
- Calixarene biscrown
- Complexation
- Crown ether
- Solvent extraction
- Synthesis
ASJC Scopus subject areas
- Food Science
- General Chemistry
- Condensed Matter Physics